Patents by Inventor Yoshiro Yoneda

Yoshiro Yoneda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6282067
    Abstract: A magnetoresistive effect element 5 is physically configured such that the element width is at least three times as large as the element height. A plurality of domain control layers 11 to 13 are located between the magnetoresistive effect element 5 and a plurality of detecting electrodes 8 to 10 in a state that the domain control layers 11 to 13 are closely formed on the magnetoresistive effect element 5. Each of the domain control layers 11 to 13 applies a unidirectional magnetic field to a region of the magnetoresistive effect element 5 vertically disposed in a guard band of the magnetic recording medium 4, the guard band having no information recorded therein. The unidirectional magnetic field is directed in an orientation of an initial magnetization in a single magnetoresistive effect element, the orientation of which depends on a direction of on an easy axis of the magnetoresistive effect element 5.
    Type: Grant
    Filed: September 20, 1999
    Date of Patent: August 28, 2001
    Assignees: Nippon Hoso Kyokai, Pioneer Corporation
    Inventors: Kenji Machida, Naoto Hayashi, Yoshiro Yoneda, Junji Numazawa, Makiko Kohro, Takahisa Tanabe, Shinichi Nagahara
  • Patent number: 5014148
    Abstract: Improvements in the perpendicular magnetic recording and reproducing head of the type in which a main magnetic pole and an auxiliary magnetic pole are arranged as a unitary structure on one side of a magnetic recording medium. Problems are solved in relation to pseudo pulses in the output signals and change in the level, contributing to improving the sensitivity for recording and reproduction. The magnetic head is used for perpendicular VTR's. The perpendicular magnetic recording and reproducing head of the invention comprises a support block which consists of a main magnetic pole, a non-magnetic block which holds said main magnetic pole to form a surface opposed to the magnetic recording medium, and an auxiliary magnetic pole block which supports part of said main magnetic pole and which supports said non-magnetic block; and a magnetic block provided on the side surface of said support block in the direction of track width.
    Type: Grant
    Filed: March 8, 1989
    Date of Patent: May 7, 1991
    Assignees: Nippon Hoso Kyokai, Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Junji Numazawa, Yoshiro Yoneda, Fusayoshi Aruga